Steph likes basketballs and sneakers. He has well-defined indifference curves, which are bowed towards the origin and do not intersect either axis. The price of basketballs is $30 and the price of sneakers is $90. If the Steph's marginal rate of substitution of sneakers for basketballs (marginal utility of sneakers / marginal utility of basketballs) is 2, is he consuming an optimal bundle? If not, should he buy more basketballs or sneakers? can you provide the Formula that you will use?

NO IMAGE UPLOAD SHOW CALCULATION